Display screen or portion thereof with a graphical user interface



The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.

The sole FIGURE is a front view of a display screen or portion thereof with a graphical user interface, showing the new design.

The broken lines in the drawing are included for the purpose of illustrating an electronic device and portions of the display screen and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 